package com.itheima.reggie.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.Setmeal;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {
    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 判断当前分类下是否关联菜品或是套餐，若关联则不允许删除操作，不关联则正常删除
     * @param id
     */
    @Override
    public void remove(Long id) {
        //创建条件构造器（Dish）
        LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件
        dishLambdaQueryWrapper.eq(Dish::getCategoryId,id);
        //查询关联菜品数
        int count1 = dishService.count(dishLambdaQueryWrapper);
        //进行判断
        if(count1>0){
            throw new CustomException("当前分类下关联了菜品，无法删除");
        }

        //创建条件构造器（Setmeal）
        LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //添加查询条件
        setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId,id);
        //查询关联套餐数
        int count2 = setmealService.count(setmealLambdaQueryWrapper);
        //进行判断
        if(count2>0){
            throw new CustomException("当前分类下关联了套餐，无法删除");
        }

        //若既没关联菜品也没关联套餐则直接删除
        super.removeById(id);
    }
}
